In a press conference, the league boss said the integrity unit had found no evidence that Simona had change his play to ensure he won what Greenberg labelled "modest" bets.

"At the end of the day he has deliberately flouted the laws of the game for his own gain and there is no place for him in the NRL," Greenberg said.

"This is a warning to everyone in our game that if you try to meddle with the integrity of the game you will be caught and the consequences will be harsh."

Tigers back Simona's ban

Greenberg said Simona clearly had personal issues and the game would offer welfare services and monitor his wellbeing.

"He has worked very hard to become and elite athlete and he has now thrown that away," he told reporters.

The Tigers said they were "incredibly disappointed" but fully supported the league's call to deregister the 25-year-old and the club's chief executive, Justin Pascoe, said they would also ensure "Simona receives the welfare support that he needs".

"At Wests Tigers we are very proud of our position in the community," he said.

"We will not allow the actions of an individual player to jeopardise what this club stands for and represents."

Pascoe said he was "100 per cent confident that this is isolated to Tim Simona" and integrity unit boss Nick Weeks said there was no evidence anyone else was involved.